Fresh, soaked grains aren't completely awful for you like the rancid, high phytase, freakishly high gluten grains we're used to, they're just still not ideal. Grass-fed dairy is fine for most people. Glucose isn't the issue outside the context of a broken metabolism.
Also, there's no freaking way they're having kids at 80. The actual Hunza life expectancy is about 53 with an admittedly large standard deviation.